Clip pen



FIG. 1 is a perspective view.

FIG. 2 is a front view.

FIG. 3 is a rear side view.

FIG. 4 is a left side view.

FIG. 5 is a right side view.

FIG. 6 is a bottom view; and,

FIG. 7 is a top view. 

The ornamental design for a clip pen, as shown and described. 